(1) This chapter applies to greywater irrigation systems with design flows under three thousand five hundred gallons per day.

(2) This chapter does not apply to the reuse of greywater inside buildings regulated under the Uniform Plumbing Code as adopted in chapter 51-56 WAC.

(3) This chapter does not apply to reclaimed water use facilities regulated under chapters 90.46 RCW and 173-219 WAC.